SYZFAIL: netlink_send_ext: bad netlink ack type

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 2d19be46 Linux 4.19.177
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=14d6fccad00000
kernel config: https://syzkaller.appspot.com/x/.config?x=6a1a8f0ba6627eb7
dashboard link: https://syzkaller.appspot.com/bug?extid=e608200462ab5329a493
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1022545cd00000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+e60820...@syzkaller.appspotmail.com

2021/02/23 18:09:28 result: hanged=false err=executor 2: exit status 67
type=35 (errno 22: Invalid argument)
SYZFAIL: netlink_send_ext: bad netlink ack type
(errno 0: Success)
SYZFAIL: child failed
loop exited with status 67


type=35 (errno 22: Invalid argument)
SYZFAIL: netlink_send_ext: bad netlink ack type
(errno 0: Success)
SYZFAIL: child failed
loop exited with status 67
2021/02/23 18:09:28 executed programs: 6
2021/02/23 18:09:37 executed programs: 23


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